ML15310A085: Difference between revisions

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==SUBJECT:==
==SUBJECT:==
 
WATTS BAR NUCLEAR PLANT, UNITS 1 AND 2 -STAFF ASSESSMENT OF RESPONSE TO REQUEST FOR INFORMATION PURSUANT TO 10 CFR 50.54(f) FLOOD-CAUSING MECHANISMS REEVALUATION (TAC NOS. MF5857 AND MF5858)  
WATTS BAR NUCLEAR PLANT, UNITS 1 AND 2 -STAFF ASSESSMENT OF RESPONSE TO REQUEST FOR INFORMATION PURSUANT TO 10 CFR 50.54(f)
FLOOD-CAUSING MECHANISMS REEVALUATION (TAC NOS. MF5857 AND MF5858)  


==Dear Mr. Shea:==
==Dear Mr. Shea:==
By letter dated March 12, 2012, the U.S. Nuclear Regulatory Commission (NRC) issued a request for information pursuant to Title 10 of the Code of Federal Regulations, Section 50.54(f)  
By letter dated March 12, 2012, the U.S. Nuclear Regulatory Commission (NRC) issued a request for information pursuant to Title 10 of the Code of Federal Regulations, Section 50.54(f) (hereafter referred to as the 50.54(f) letter). The request was issued as part of implementing lessons-learned from the accident at the Fukushima Dai-ichi nuclear power plant. Enclosure 2 to the 50.54(f) letter requested licensees to reevaluate flood-causing mechanisms using present-day methodologies and guidance.
(hereafter referred to as the 50.54(f) letter).
By letters dated March 12, 2015 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML 15084A323), and June 16, 2015 (ADAMS Accession No. ML 15169A906, Non-Public, Security Related Information), Tennessee Valley Authority (TVA, the licensee) responded to this request for Watts Bar Nuclear Plant, Units 1 and 2 (Watts Bar). By letter dated September 3, 2015 1 , the NRC staff transmitted to TVA a summary of the staff's review of the licensee's reevaluated flood-causing mechanisms.
The request was issued as part of implementing lessons-learned from the accident at the Fukushima Dai-ichi nuclear power plant. Enclosure 2 to the 50.54(f) letter requested licensees to reevaluate flood-causing mechanisms using present-day methodologies and guidance.
The enclosed staff assessment provides the documentation supporting the NRC staff's conclusions summarized in the letter 1. As stated in the letter, the reevaluated flood hazard results for local intense precipitation and streams and rivers were not bounded by the current design-basis flood hazard. In order to complete its response to Enclosure 2 to the 50.54(f) letter, the licensee is expected to submit a revised integrated assessment or a focused evaluation, as appropriate, to address these reevaluated flood hazards, as described in the NRC's September 1, 2015, letter (ADAMS Accession No. ML 15174A257).
By letters dated March 12, 2015 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML 15084A323),
and June 16, 2015 (ADAMS Accession No. ML 15169A906, Non-Public, Security Related Information),
Tennessee Valley Authority (TVA, the licensee) responded to this request for Watts Bar Nuclear Plant, Units 1 and 2 (Watts Bar). By letter dated September 3, 20151, the NRC staff transmitted to TVA a summary of the staff's review of the licensee's reevaluated flood-causing mechanisms.
The enclosed staff assessment provides the documentation supporting the NRC staff's conclusions summarized in the letter1. As stated in the letter, the reevaluated flood hazard results for local intense precipitation and streams and rivers were not bounded by the current design-basis flood hazard. In order to complete its response to Enclosure 2 to the 50.54(f) letter, the licensee is expected to submit a revised integrated assessment or a focused evaluation, as appropriate, to address these reevaluated flood hazards, as described in the NRC's September 1, 2015, letter (ADAMS Accession No. ML 15174A257).
The enclosed staff assessment, determined that you provided sufficient information in response to the 50.54(f) letter. This closes out the NRC's efforts associated with TAC Nos. MF5857 and MF5858. The Enclosure transmitted herewith contains Security-Related Information.
The enclosed staff assessment, determined that you provided sufficient information in response to the 50.54(f) letter. This closes out the NRC's efforts associated with TAC Nos. MF5857 and MF5858. The Enclosure transmitted herewith contains Security-Related Information.
When separated from the Enclosure, this document is decontrolled.
When separated from the Enclosure, this document is decontrolled.
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==Enclosure:==
==Enclosure:==


Staff Assessment of Flood Hazard Reevaluation Report cc w/encl: Distribution via Listserv Sincerely,  
Staff Assessment of Flood Hazard Reevaluation Report cc w/encl: Distribution via Listserv Sincerely, -{-Juan Uribe, Project Manager Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation OFFICIAL I !SE ONLY SECURITY REb.ATED INFORMATION OfflCIAb IJSe ONbV SECIJRITV RELATED INFORMATION J. Shea If you have any questions, please contact me at (301) 415-3809 or e-mail at Juan.Uribe@nrc.gov.
-{-Juan Uribe, Project Manager Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation OFFICIAL I !SE ONLY SECURITY REb.ATED INFORMATION OfflCIAb IJSe ONbV SECIJRITV RELATED INFORMATION J. Shea If you have any questions, please contact me at (301) 415-3809 or e-mail at Juan.Uribe@nrc.gov.
Docket Nos. 50-390 and 50-391  
Docket Nos. 50-390 and 50-391  


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Sincerely, IRA/ Juan Uribe, Project Manager Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation Staff Assessment of Flood Hazard Reevaluation Report cc w/encl: Distribution via Listserv DISTRIBUTION:
Sincerely, IRA/ Juan Uribe, Project Manager Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation Staff Assessment of Flood Hazard Reevaluation Report cc w/encl: Distribution via Listserv DISTRIBUTION:
PUBLIC JUribe, NRR JBowen, NRR RidsNrrDorllp_WB Resource RidsOpaMail Resource ACampbell,NRO  
PUBLIC JUribe, NRR JBowen, NRR RidsNrrDorllp_WB Resource RidsOpaMail Resource ACampbell,NRO MMcBride, NRO MWillingham, NRO ARivera-Varona, NRO JLD R/F MShams, NRR MFranovich, NRR RidsNrrDorl Resource RidsNrrLASLent SBreithaupt, NRO RidsNroDsea Resource CCook, NRO RidsNRRJLD Resource JDavis, NRR RidsN rrPMWattsBar Resource RidsRgn2MailCenter RidsOgcMailCenter Resource MBensi, NRO RidsNrrJLD Resource RidsAcrsAcnw_MailCtr Resource ADAMS Accession Nos.: Pkg. ML 1531 OA080; PUBLIC Letter. ML 15310A085; NON PUBLIC. ML 15302A408  
: MMcBride, NRO MWillingham, NRO ARivera-Varona, NRO JLD R/F MShams, NRR MFranovich, NRR RidsNrrDorl Resource RidsNrrLASLent SBreithaupt, NRO RidsNroDsea Resource CCook, NRO RidsNRRJLD Resource JDavis, NRR RidsN rrPMWattsBar Resource RidsRgn2MailCenter RidsOgcMailCenter Resource MBensi, NRO RidsNrrJLD Resource RidsAcrsAcnw_MailCtr Resource ADAMS Accession Nos.: Pkg. ML 1531 OA080; PUBLIC Letter. ML 15310A085; NON PUBLIC. ML 15302A408  
*via email OFFICE NRR/JLD/JHMB/PM NRR/JLD/LA NRO/DSEA/RHM2/BC NAME JUribe SLent CCook DATE 11/9/2015 11/9/2015 11/27/2015 OFFICE NRR/JLD/JHMB/BC NRR/JLD/JHMB/PM NAME MS hams JUribe DATE 12/1/2015 12/1/2015 OFFICIAL RECORD COPY OFFICIAL USE ONbV SeCIJRITV RebATED INFORMATION}}
*via email OFFICE NRR/JLD/JHMB/PM NRR/JLD/LA NRO/DSEA/RHM2/BC NAME JUribe SLent CCook DATE 11/9/2015 11/9/2015 11/27/2015 OFFICE NRR/JLD/JHMB/BC NRR/JLD/JHMB/PM NAME MS hams JUribe DATE 12/1/2015 12/1/2015 OFFICIAL RECORD COPY OFFICIAL USE ONbV SeCIJRITV RebATED INFORMATION}}

Revision as of 20:32, 8 July 2018

Watts Bar Nuclear Plant, Units 1 and 2 (Public Version) - Staff Assessment of Response to Request for Information Pursuant to 10 CFR 50.54(f) Flood Causing Mechanisms Reevaluation
ML15310A085
Person / Time
Site: Watts Bar  Tennessee Valley Authority icon.png
Issue date: 12/01/2015
From: Uribe J F
Japan Lessons-Learned Division
To: Shea J W
Tennessee Valley Authority
Uribe J F
References
TAC MF5858, TAC MF5857
Download: ML15310A085 (3)
v • d • e


Text

{{#Wiki_filter:. OFFICIAL USE ONbY SECYRITY RELATED INFORMATION UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 Mr. Joseph W. Shea Vice President, Nuclear Licensing Tennessee Valley Authority 1101 Market Street, LP 3R-C Chattanooga, TN 37402-2801 December 1, 2015

SUBJECT:

WATTS BAR NUCLEAR PLANT, UNITS 1 AND 2 -STAFF ASSESSMENT OF RESPONSE TO REQUEST FOR INFORMATION PURSUANT TO 10 CFR 50.54(f) FLOOD-CAUSING MECHANISMS REEVALUATION (TAC NOS. MF5857 AND MF5858)

Dear Mr. Shea:

By letter dated March 12, 2012, the U.S. Nuclear Regulatory Commission (NRC) issued a request for information pursuant to Title 10 of the Code of Federal Regulations, Section 50.54(f) (hereafter referred to as the 50.54(f) letter). The request was issued as part of implementing lessons-learned from the accident at the Fukushima Dai-ichi nuclear power plant. Enclosure 2 to the 50.54(f) letter requested licensees to reevaluate flood-causing mechanisms using present-day methodologies and guidance. By letters dated March 12, 2015 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML 15084A323), and June 16, 2015 (ADAMS Accession No. ML 15169A906, Non-Public, Security Related Information), Tennessee Valley Authority (TVA, the licensee) responded to this request for Watts Bar Nuclear Plant, Units 1 and 2 (Watts Bar). By letter dated September 3, 2015 1 , the NRC staff transmitted to TVA a summary of the staff's review of the licensee's reevaluated flood-causing mechanisms. The enclosed staff assessment provides the documentation supporting the NRC staff's conclusions summarized in the letter 1. As stated in the letter, the reevaluated flood hazard results for local intense precipitation and streams and rivers were not bounded by the current design-basis flood hazard. In order to complete its response to Enclosure 2 to the 50.54(f) letter, the licensee is expected to submit a revised integrated assessment or a focused evaluation, as appropriate, to address these reevaluated flood hazards, as described in the NRC's September 1, 2015, letter (ADAMS Accession No. ML 15174A257). The enclosed staff assessment, determined that you provided sufficient information in response to the 50.54(f) letter. This closes out the NRC's efforts associated with TAC Nos. MF5857 and MF5858. The Enclosure transmitted herewith contains Security-Related Information. When separated from the Enclosure, this document is decontrolled. 1 ADAMS Accession No. ML 152398292 Of'.f'.ICIAL USE ONLY SECURITY RELATED INFORMATION OFFICIAL' 'SE ONLY SECURITY RELATED INFORMATION J. Shea If you have any questions, please contact me at (301) 415-3809 or e-mail at Juan.Uribe@nrc.gov. Docket Nos. 50-390 and 50-391

Enclosure:

Staff Assessment of Flood Hazard Reevaluation Report cc w/encl: Distribution via Listserv Sincerely, -{-Juan Uribe, Project Manager Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation OFFICIAL I !SE ONLY SECURITY REb.ATED INFORMATION OfflCIAb IJSe ONbV SECIJRITV RELATED INFORMATION J. Shea If you have any questions, please contact me at (301) 415-3809 or e-mail at Juan.Uribe@nrc.gov. Docket Nos. 50-390 and 50-391

Enclosure:

Sincerely, IRA/ Juan Uribe, Project Manager Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation Staff Assessment of Flood Hazard Reevaluation Report cc w/encl: Distribution via Listserv DISTRIBUTION: PUBLIC JUribe, NRR JBowen, NRR RidsNrrDorllp_WB Resource RidsOpaMail Resource ACampbell,NRO MMcBride, NRO MWillingham, NRO ARivera-Varona, NRO JLD R/F MShams, NRR MFranovich, NRR RidsNrrDorl Resource RidsNrrLASLent SBreithaupt, NRO RidsNroDsea Resource CCook, NRO RidsNRRJLD Resource JDavis, NRR RidsN rrPMWattsBar Resource RidsRgn2MailCenter RidsOgcMailCenter Resource MBensi, NRO RidsNrrJLD Resource RidsAcrsAcnw_MailCtr Resource ADAMS Accession Nos.: Pkg. ML 1531 OA080; PUBLIC Letter. ML 15310A085; NON PUBLIC. ML 15302A408

  • via email OFFICE NRR/JLD/JHMB/PM NRR/JLD/LA NRO/DSEA/RHM2/BC NAME JUribe SLent CCook DATE 11/9/2015 11/9/2015 11/27/2015 OFFICE NRR/JLD/JHMB/BC NRR/JLD/JHMB/PM NAME MS hams JUribe DATE 12/1/2015 12/1/2015 OFFICIAL RECORD COPY OFFICIAL USE ONbV SeCIJRITV RebATED INFORMATION}}
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